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Finding the Fourth Proportional to 931.68, 1,285.18 and 821.42

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Solution

The fourth proportional to 931.68, 1,285.18 and 821.42 is: 1,133.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.68 : 1,285.18 = 821.42 : x
  2. Step 2: Convert to fraction form
    931.68/1,285.18 = 821.42/x
  3. Step 3: Cross multiply
    931.68x = 1,285.18 × 821.42
  4. Step 4: Simplify right side
    931.68x = 1,055,672.56
  5. Step 5: Solve for x
    x = 1,055,672.56/931.68
  6. Step 6: Final answer
    x = 1,133.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.